• Vikas Nagrale
• Ashutosh Kumar
• Mayur Yalij
• Prof S.V.Shinde

Data integrity maintenance is that the major objective in cloud storage. It includes audition using TTP for unauthorized access. This work implements protecting the information and regeneration of information if someone mishandles it. This job are going to be assigned to a Proxy server. the info of the users are going to be stored publicly and personal area of the cloud. so only public cloud data are going to be accessed by user and personal cloud will remain more secured. Once any unauthorized modification is formed, the first data within the private cloud are going to be retrieved by the Proxy server and can be returned to the user. Cloud storage generally provides different redundancy configuration to users so as to take care of the specified balance between performance and fault tolerance. Data availability is critical in distributed storage systems, mostly when node failures are prevalent in real world. This research work explores about secure data storage and sharing using proposed AES 128 encryption algorithm and Role Base Access Control (RBAC) for secure data access scheme for user. This work also dispensed backup server approach it works like proxy storage server for spontaneous data recovery for all distributed data servers. The experiment analysis has proposed publicly similarly as private cloud environment

El Gamal encryption scheme, Secure user access policy, Proxy Key Generation Role Base Access Control (RBAC), Advanced encryption standard (AES), TPA (Third Party Auditor), TMACS: Threshold Multi-Authority Access Control System

"Data Security of Dynamic and Robust Role Based Access Control from Multiple Authorities in Cloud Environment", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 6, page no.b302-b308, June-2022, Available :http://www.jetir.org/papers/JETIR2206142.pdf

"Data Security of Dynamic and Robust Role Based Access Control from Multiple Authorities in Cloud Environment", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 6, page no. ppb302-b308, June-2022, Available at : http://www.jetir.org/papers/JETIR2206142.pdf